22 Sudanese political parties signed a memorandum on Tuesday which was sent to President Omar al-Bashir, calling for the dissolution of the Sudanese government and parliament.
The parties also demanded the formation of a transitional council to manage the country, in addition to forming a transitional government that combines competencies and equal political representation.
An Al Arabiya correspondent reported that the al-Islah party withdrew all of its representatives from the government.
Earlier on Tuesday, al-Bashir had issued a decree to form an investigative committee to probe the violence that occurred during anti-government protests.
According to official numbers, at least 19 persons were killed and hundreds injured during the protests that started on December 19 in several cities, including Khartoum, after a governmental decision to raise the prices of bread and fuel.
Protests quickly turned into marches that criticized government policy in Khartoum and other Sudanese regions.
Protesters burnt several buildings and offices of the ruling National Congress Party. Riot police managed to break up the marches.
Despite the fact that Washington had lifted economic sanctions imposed on Sudan since October 2017, it is facing a foreign exchange crisis amid rising inflation.